Grigorovich I-1
{{More footnotes|date=August 2013}}
| {{Infobox aircraft begin
| name=Grigorovich I-1 | image= | caption= }}{{Infobox aircraft type | type=Fighter | national origin=Soviet Union | manufacturer=Grigorovich Design Bureau | designer=Dmitry Pavlovich Grigorovich | first flight=January 1924 | introduced= | retired= | status=Prototype | primary user= | number built=1 | developed from= | variants with their own articles=Grigorovich I-2 }} |
The Grigorovich I-1 was a Soviet fighter prototype of the 1920s. It was the first land-based fighter developed by the Grigorovich Design Bureau, who had previously concentrated on water-borne aircraft such as the Grigorovich M-5 of 1914.
Development
Initially, design was started on a single-seat fighter by Dmitry Pavlovich Grigorovich, to compete with the Polikarpov I-1 biplane. The finished aircraft, finalised in 1924 and produced at Factory No. 1, at Khodinka, near Moscow, was a single-seat, single-bay biplane of wooden construction, with the forward portion of the fuselage being covered in plywood and the rear having fabric skinning. In development, a major problem was that of engine cooling - various methods were tested including radiators attached to the undercarriage legs, but in the end a radiator suspended beneath the engine was used.
Operational history
After an initial flight in January 1924, testing took place in the spring of that year. The I-1 was found to have adequate speed for its purpose but its construction and therefore its flight were unstable, and its climb rate was found to be insufficient with repeated stalls. Therefore, the prototype was abandoned, and Grigorovich refined the design into the Grigorovich I-2 which later entered service in the Soviet Air Force.
Variants
:Aerodynamically more refined version of the I-1, entered service in 1926.
Specifications (I-1)
{{Aircraft specs
|ref=The Complete Book of Fighters{{cite book |last=Green |first=William |author2=Gordon Swanborough |title=The Complete Book of Fighters |publisher=Salamander Books|location=Godalming, UK|pages=256–257}}
|prime units?=met
|crew=one
|length m=7.32
|length note=
|span m=10.8
|span note=
|height m=
|height note=
|wing area sqm=26.8
|wing area note=
|aspect ratio=
|empty weight kg=
|empty weight note=
|gross weight kg=
|gross weight note=
|max takeoff weight kg=
|max takeoff weight note=
|fuel capacity=
|more general=
|eng1 number=1
|eng1 name=Liberty L-12
|eng1 type=V-12 water-cooled piston engine
|eng1 hp=400
|eng1 note=
|prop blade number=2
|prop name=wooden fixed-pitch propeller
|prop dia m=
|prop dia note=
|max speed kmh=230
|max speed note=
|cruise speed kmh=
|cruise speed note=
|stall speed kmh=
|stall speed note=
|never exceed speed kmh=
|never exceed speed note=
|range km=600
|range note=
|combat range km=
|combat range note=
|ferry range km=
|ferry range note=
|endurance=
|ceiling m=6000
|ceiling note=
|g limits=
|roll rate=
|climb rate ms=
|climb rate note=
|time to altitude=
|wing loading kg/m2=
|wing loading note=
|fuel consumption kg/km=
|power/mass=
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|more performance=
|guns=2 x 7.7mm Vickers machine-guns
}}
See also
References
{{reflist}}
{{Grigorovich aircraft}}
{{Soviet fighter designations}}